<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert
        title="添加商品信息"
        type="info"
        center
        show-icon
        :colsable="false">
      </el-alert>

      <!-- 步骤条区域 --> 
      <el-steps :space="200" :active="activeIndex - 0" 
      finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- tab栏区域 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" 
      label-width="100px" label-position="top">
      <el-tabs v-model="activeIndex" :tab-position="'left'"
      :before-leave="beforeTabLeave" @tab-click="tabClicked">
        <el-tab-pane label="基本信息" name="0">
        <el-form-item label="商品名称" prop="goods_name">
          <el-input v-model="addForm.goods_name"></el-input>
        </el-form-item>
        <el-form-item label="商品价格" prop="goods_price">
          <el-input v-model="addForm.goods_price" 
          type="number"></el-input>
        </el-form-item>
        <el-form-item label="商品重量" prop="goods_weight">
          <el-input v-model="addForm.goods_weight"
          type="number"></el-input>
        </el-form-item>
        <el-form-item label="商品数量" prop="goods_number">
          <el-input v-model="addForm.goods_number"
          type="number"></el-input>
        </el-form-item>
        <el-form-item label="商品分类" prop="goods_cat">
          <el-cascader
          v-model="addForm.goods_cat"
          :options="catelist"
          expandTrigger='hover'
          @change="handleChange"
          :props="cateProps">
          </el-cascader>
        </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品参数" name="1">
          <!-- 渲染表单的Item项 -->
          <el-form-item :label="item.attr_name" v-for="(item, index) in manyTableData"
          :key="index">
            <!-- 复选框组 -->
            <el-checkbox-group v-model="item.attr_vals">
              <el-checkbox :label="cb" v-for="(cb, index) in item.attr_vals"
              :key="index" border></el-checkbox>
            </el-checkbox-group>
          </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品属性" name="2">
          <el-form-item :label="item.attr_name" v-for="(item, index) in onlyTableData"
          :key="index">
            <el-input v-model="item.attr_vals"></el-input>
          </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品图片" name="3">
          <!-- action表示图片要上传到的后台API地址 -->
          <el-upload
            :action="uploadURL"
            :on-preview="handlePreview"
            :on-remove="handleRemove" 
            list-type="picture" :headers="headerObj" :on-success="handleSuccess">
            <el-button size="small" type="primary">点击上传</el-button>
          </el-upload>
        </el-tab-pane>
        <el-tab-pane label="商品内容" name="4">
          <!-- 富文本编辑器组件 -->
          <quill-editor v-model="addForm.goods_introduce">
          </quill-editor>

          <!-- 添加商品的按钮 -->
          <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
        </el-tab-pane>
      </el-tabs>
      </el-form>
    </el-card>

    <!-- 图片预览 -->
    <el-dialog
      title="图片预览"
      :visible.sync="previewVisible"
      width="50%">
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
  export default{
    name: 'Add',
    data() {
      return {
        activeIndex: 0,
        // 添加商品的表单数据对象
        addForm: {
          goods_name: '',
          goods_price: 0,
          goods_weight: 0,
          goods_number: 0,
          // 商品所属的分类数组
          goods_cat: [],
          // 图片的数组
          pics: [],
          // 商品的详情描述
          goods_introduce: '',
          attrs: []
        },
        addFormRules: {
          goods_name: [
            { required: true, message: "请输入商品名称",
            trigger: "blur"},
          ],
          goods_price: [
            { required: true, message: "请输入商品价格",
            trigger: "blur"}, 
          ],
          goods_weight: [
            { required: true, message: "请输入商品重量",
            trigger: "blur"}, 
          ], 
          goods_number: [
            { required: true, message: "请输入商品重量",
            trigger: "blur"}, 
          ],
          goods_cat: [
            { required: true, message: "请选择商品分类",
            trigger: "blur"}, 
          ]
        },
        // 商品分类列表
        catelist: [],
        cateProps: {
          label: 'cat_name',
          value: 'cat_id',
          children: 'children'
        },
        // 动态参数列表数据
        manyTableData: [],
        // 静态属性列表数据
        onlyTableData: [],
        // 上传图片的URL地址
        uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
        // 图片上传组件的headers请求头对象
        headerObj: {
          Authorization: window.sessionStorage.getItem('token')
        },
        previewPath: "",
        previewVisible: false
      }
    },
    created() {
      this.getCateList()
    },
    methods: {
      // 这是获取所有商品分类数据
      async getCateList() {
        const {data: res} = await this.$http.get
        ('categories')

        if(res.meta.status !== 200) {
          return this.$message.error('获取商品分类数据失败!')
        }

        this.catelist = res.data 
        console.log(this.catelist)
      },
      // 级联选择器选中项发生变化会触发这个函数
      handleChange() {
        // console.log(this.addForm.goods_cat)
        if(this.addForm.goods_cat.length !== 3) {
          this.addForm.goods_cat = []
        }
      },
      beforeTabLeave(activeName, oldActiveName) { 
        if(oldActiveName === '0' && 
        this.addForm.goods_cat.length !== 3) {
          this.$message.error('请选择商品分类')
          return false
        }
      },
      async tabClicked() {
        // console.log(this.activeIndex)
        // 证明访问的是动态参数面板
        if(this.activeIndex === '1') {
          // console.log('动态参数面板')
          const {data: res} = await this.$http.get
          (`categories/${this.cateId}/attributes`, {
            params: { sel: 'many' }
          })

          if(res.meta.status !== 200) {
            return this.$message.error('获取动态参数列表失败!')
          }

          console.log(res.data)
          res.data.forEach(item => {
            item.attr_vals = 
              item.attr_vals.length === 0 ? []
              : item.attr_vals.split(',')
          })
          this.manyTableData = res.data
        }else if(this.activeIndex === '2') {
          const {data: res} = await this.$http.get
          (`categories/${this.cateId}/attributes`, {
            params: { sel: 'only' }
          })

          if(res.meta.status !== 200) {
            return this.$message.error('获取静态属性失败!')
          }

          console.log(res.data)
          this.onlyTableData = res.data
        }
      },
      // 处理图片预览效果
      handlePreview(file) {
        // console.log(file)
        this. previewPath = file.response.data.url
        this.previewVisible = true
      },
      //处理移除图片的操作   
      handleRemove(file) {
        console.log(file)
        // 1.获取将要删除的图片的临时路径
        const filePath = file.response.data.tmp_path
        // 2.从 pics 数组中,找到这个图片的对应索引值
        const i = this.addForm.pics.findIndex(x =>
        x.pic === filePath)
        // 3.调用数组的splice方法,把图片信息对象,从pics数组中移除
        this.addForm.pics.splice(i, 1)
        console.log(this.addForm)
      },
      // 监听图片上传成功的事件
      handleSuccess(response) {
        // console.log(response)
        // 1. 拼接得到一个图片信息对象
        const picInfo = {pic: response.data.tmp_path}
        // 2. 将图片信息对象push到pics数组对象中
        this.addForm.pics.push(picInfo)
        // console.log(this.addForm)
      },
      // 添加商品
      add() {
        // console.log(this.addForm)
        this.$refs.addFormRef.validate(async valid => {
          if(!valid) {
            return this.$message.error('请填写必要的表单项!')
          }
          // 执行添加的业务逻辑
          // lodash cloneDeep(obj)
          const form  = _.cloneDeep(this.addForm)
          form.goods_cat = 
          form.goods_cat.join(',')
          // 处理动态参数
          this.manyTableData.forEach(item => {
            const newInfo = {attr_id: item.attr_id, 
            attr_value: item.attr_vals.join(',')}
            this.addForm.attrs.push(newInfo)
          })
          // 处理静态属性
          this.onlyTableData.forEach(item => {
            const newInfo = {attr_id: item.attr_id,
            attr_value: item.attr_vals}
            this.addForm.attrs.push(newInfo)
          })
          form.attrs = this.addForm.attrs
          console.log(form)

          // 发起请求添加商品
          // 商品的名称必须是唯一的
          const {data: res} = await this.$http.post
          ('goods', form)

          if(res.meta.status !== 201) {
            return this.$message.error('添加商品失败!')
          }

          this.$message.success('添加商品成功!')
          this.$router.push('/goods')
          }
        )
      }
    },
    computed: {
      cateId() {
        if(this.addForm.goods_cat.length === 3) {
          return this.addForm.goods_cat[2]
        }
        return null
      }  
    },

  }
</script>

<style lang="less" scoped>
.el-checkbox {
  margin: 0 10px 0 0!important;
} 

.previewImg {
  width: 100%;
}

.btnAdd {
  margin-top: 15px;
}
</style>
